New control - Maps and also adding "ExtensionContext" to PeoplePicker and List Cntrol

[anoopt]

Q	A
Bug fix?	[ ]
New feature?	[X ]
New sample?	[X ]
Related issues?	NA

What's in this Pull Request?

1. Added a new control called "Maps" as a response to #14

The current version of the submitted PR, accepts co-ordinates (latitude and longitude) as properties and displays OpenStreetMap for the co-ordinates.
The plan is to add "city search" in the upcoming weeks and use Google's geocode service to get co-ordinates for the entered city. This will need API key (which is free only for some queries and after that would need billing enabled for premium services).

Default Maps control (with co-ordinates set to London)

Maps control with search

2. Added "ExtensionContext" reference in ListPicker and PeoplePicker controls.

There are times when we would need to use these controls in SPFx extensions as well. Hence I have added the reference to "ExtensionContext" in these controls and the context in these controls can now be of the type "WebPartContext" or "ExtensionContext".

context: WebPartContext | ExtensionContext;

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[codecov-io]

Codecov Report

Merging #186 into dev will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev     #186   +/-   ##
=======================================
  Coverage   80.63%   80.63%           
=======================================
  Files          10       10           
  Lines         346      346           
  Branches       71       78    +7     
=======================================
  Hits          279      279           
  Misses         44       44           
  Partials       23       23

Impacted Files	Coverage Δ
src/loc/en-us.ts	100% <ø> (ø)	⬆️

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[estruyf]

Thanks @anoopt, your map control has been merged to the DEV branch and will be available in version 1.11.0.

I have also applied a couple of code changes for consistency, but also got rid of the Bing API.

[anoopt]

Thank you @estruyf for the code update and consistency. TIL we can get the co-ordinates using "https://nominatim.openstreetmap.org".